68 metres across and 48 metres long (two pylons rest on each abutment tower)

Total length of bridge

1149 metres including approach spans

Bearing Pins

Each of the four pins measures 4.2 metres long and 368 millimetres in diameter

Thrust on bearings

Under maximum load approximately 20,000 tonnes on each bearing

Number of rivets

Approximately 6,000,000

Largest rivet

Weighed 3.5 kilograms and was 395 millimetres long

Longest Hanger

58.8 metres

Shortest Hanger

7.3 metres

Total weight of steelwork

52,800 tonnes including arch and mild steel approach spans

Weight of arch

39,000 tonnes

Rock excavated for foundations

122,000 cubic metres

Concrete used for bridge

95,000 cubic metres

Granite facing used on pylons & piers

18,000 cubic metres

Allowance for deck expansion

420 millimetres

Allowance for arch expansion

The arch may rise or fall 18 centimetres due to heating or cooling

Number of panels in arch

28, each 18.28 metres wide

Record tonnage erected

589 tonnes of steelwork was erected on the arch in one day on 26 November 1929

Paint required

272,000 litres of paint were required to give the Bridge its initial three coats.

Strewth! Thats a big Pin!4.2 metres (thats 14 foot!) long and 368 millimetres (14 and a half inches) thick.There's four of them to hold the whole thing up.But then they need to be big - they hold up twenty thousand tonnes each!